73 Magazine June 1972 (#141)

Six Elements on Twenty Meters - Eliminate QRM ...... VE3GEJ 17
Slow Scan Television - Basics ...... G5ZT 21
Beaming the Vertical Antenna - On the low bands ...... W6AJE 27
Active Filter Design and Use - All kinds of filters Part I ...... K3PUR 36
Antenna Party - Simplified erection ...... W0BMW 45
Radio Astronomy for Amateurs (Part II ) - Projects for amateurs to tackle ...... W4ZBE 51
Patenting Your Invention - Why not ... why? ...... Hunter 61
20 dB Beams - Design and construction of VHF antennas ...... K1CLL 67
Converting the Progress Line - FM featurette ...... WB9CXE 75
Phasing Multiband Verticals - Ten thru eighty meters ...... K0WF 85
Ham TV and Public Service - PR the name of the game ...... W9JER 89
Modified Suction Cup Antenna - Not too modified ...... WZEE4 93
300 MHz Frequency Scaler - Extends frequency counters to VHF ...... K2OAW 97
73 Reviews the Savoy Antenna - Two and three band with vacuum traps ...... W4FQM/1 101
Care and Feeding of Tape - RTTY featurette ...... WA6PIR 109
Circuits, Circuits, Circuits - And more circuits ...... Staff 111
RTTY Filters - Elliptic function filters ...... W5EZM 115
Step On the Klutz! - Bob Manning rides again ...... K1YSD 123
Trouble Shooting For the Novice - You don't have to send it back ...... WA8OIK 129
Low Cost C D Ignition - It has advantages ...... W1KNI 133
Lightning! - Its cause and cure ...... W2FEZ 139
73 Tests the Regency Amplifier - 2m amplifier for FM is a beaut! ...... W4FQM/1 145

Index courtesy of http://www.qsl.net/kb9mwr/files/ham/73.html.

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